COIL SPRING UNIT, DRIVING FORCE TRANSMITTING DEVICE AND IMAGE FORMING APPARATUS
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United States of America Patent
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Dec 11, 2017
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Dec 13, 2016
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A coil spring unit includes a coil spring; and a metal plate supporting the coil spring, the metal plate including a plurality of supporting portions cooperative with each other to support the coil spring, wherein the supporting portions are provided by bending the metal plate at bending lines and have supporting surfaces substantially perpendicular to the bending lines, respectively, and wherein the supporting surfaces are substantially parallel with outside tangential lines of the coil spring and support the coil spring.
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